Hi All, We did some testing for Xen 4.2.1 RC1, RC2 and final RELEASE version on Intel SandyBridge and Westmere platforms. We found no regression and no fixed bug in our bug tracking list. We covered basic Windows & Linux guest bootup, live migration, power management, VT-d, SR-IOV, vCPU hot-plug features. Xen: 4.2.1 RC1/RC2/RELEASE (xen-4.2-testing.hg tree) Dom0: Linux 3.7.1 Best Regards, Yongjie (Jay)